I gave a quick update three days ago and Dan updated more completely yesterday.
http://forums.hybridz.org/index.php/topic/117162-hybridzorg-not-available/?do=findComment&comment=1098280
The main reason folks started using 5/8 bolts DECADES ago was to fit .625" ID rod ends on the tubular or modified stock LCAs. If you are not using rod ends and/or not racing, there's no benefit from using a 5/8 bolt in place of the spindle pin, IMHO.
Without knowing condition of the stock 280z rear suspension and the condition of the 240sx rear suspension that you installed, the comparison is not valid. Yes, a multi link is inherently better at locating the rear wheels and maintaining proper alignment over the range of suspension travel. But the rear suspension of the S30 is pretty good and can be made a lot better for under $1,000.
Engine choice is purely an emotional thing. Trying to hide that with lists of the pros and cons of each engine is just rationalization. My happiest customers were always the ones who picked an engine based on emotion.
If you don't have money, you spend time. There's work involved in forming and shaping the pan correctly so you would be hours ahead starting with a flat sheet of 18 gauge. Measure three times and cut once. Try to save the seat mounts from the old pans.
No stock, off the showroom floor engines with all OEM systems installed have been available for 30+ years. That test will never happen. Its really meaningless anyway.
I don't know why this is so hard for some folks... http://metric-steel.spahrmetric.com/item/tubing/metric-round-tubing/019508-12-01-010-0
http://www.speedymetals.com/pc-3411-8242-12-od-x-0035-wall-dom-steel-tube.aspx
http://www.onlinemetals.com/merchant.cfm?pid=466&step=4&showunits=inches&id=19&top_cat=1
No flame. Tokico has been out of product for almost a year and I just saw a job opening for an Aftermarket Product Manager on LinkedIn so people are leaving the company. The Bilstiens are the best option for you. It will just take some work to put together the package. I offered it (P30-0032 shocks, gland nuts, and gland nut tightening wrench) for $800 for a year or two and only sold one set. Most folks said it was too expensive.
No, the Bilstien P30 is an inverted shock and the gland nut actually seals on the sliding, hard chromed shock body. The Bilstien gland nut uses a double wiper seal. Shox.com has sourced the gland nuts for meand should have the corrct part numbers. There are also options for using the parts included in the box with the shocks. There are a couple writeups here where the person welds the female ring on the top of the strut tube and then uses the included male gland nut.
Without knowing the lockup percent of the STI diff, the lockup torque of the STI diff, the horsepower and torque curve of either engine, and the traction provided by the tires, how can you determine the lockup rate and total percent for the 4 cylinder turbo STI engine and your 6 cylinder NA L6?
Having cut the ramps on a couple BMW diffs and tuned a few OS Giken diffs for customers you need a lot more information before figuring you know more then the engineers that designed these units. The ramp cuts I did to the BMW diffs were at the request of the customer and resulted in no change in course times and a slightly more difficult car to drive.
Again, Keith, trailer capcity rating INCLUDES the weight of the trailer. You are hauiling around over 4,000 lbs. on the tires and axles, not 2,500 lbs. Please listen to us, get a dual axle trailer and stop trying the be Colin Chapman.
There were a few changes in.the 1970s with how manufactures measured horsepower here in the US. Part of the compliance steps for the Clean Air Act. Nissan probably also picked up power thorough refinements in the ECU and other engine changes.